This is an attempt to study the problems associated with the social consensus within Iranian multi-ethnic society. Data for this research was collected from relevant books and documents. The gathered data was then analyzed by using a composite-analytic model. This model is based on a theoretical framework of structural-causality and ethnic mobilization. Findings show that the Quranic teaching, constitution, political participation, security, tradition, charismatic political leadership, civil laws, revolutionary leaders and authorities from various ethnics, type of center-peripheral relations, the role of ethnics in important historical and national events are all favorable grounds for social consensus while authoritarianisms, ethnic instrumentalism, idealism, the nature of border settlements and external factors, in contrast, constitute unfavorable grounds for social integration and disintegration in Iran.